A-Level Chemistry equilibrium question

Question

N2O4(g) <==> 2NO2(g) Kp = 0.115 atm at 298K

If the equilibrium partial pressure of N2O4 is 0.500 atmosphere, calculate the equilibrium partial pressure of NO2, and the total equilibrium pressure.

Answer 1

N₂O₄(g) <==> 2NO₂(g) ... Kp = 0.115 atm

Kp = (NO₂)² / (N₂O₄)

0.115 = (x)² / 0.500

x² = 0.0575

x = 0.2398 atm = partial pressure of NO₂

Total equilibrium pressure = 0.2398 atm + 0.500 atm = 0.740 atm